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Open AccessArticle

Influence of Microstructural Morphology on Hydrogen Embrittlement in a Medium-Mn Steel Fe-12Mn-3Al-0.05C

1
Steel Institute (IEHK), RWTH Aachen University, Intzestraße 1, 52072 Aachen, Germany
2
IEK-2, Forschungszentrum Jülich, Wilhelm-Johnen-Straße, 52425 Jülich, Germany
*
Author to whom correspondence should be addressed.
Metals 2019, 9(9), 929; https://doi.org/10.3390/met9090929
Received: 24 June 2019 / Revised: 6 August 2019 / Accepted: 21 August 2019 / Published: 24 August 2019
(This article belongs to the Special Issue Physical Metallurgy of High Manganese Steels)
The ultrafine-grained (UFG) duplex microstructure of medium-Mn steel consists of a considerable amount of austenite and ferrite/martensite, achieving an extraordinary balance of mechanical properties and alloying cost. In the present work, two heat treatment routes were performed on a cold-rolled medium-Mn steel Fe-12Mn-3Al-0.05C (wt.%) to achieve comparable mechanical properties with different microstructural morphologies. One heat treatment was merely austenite-reverted-transformation (ART) annealing and the other one was a successive combination of austenitization (AUS) and ART annealing. The distinct responses to hydrogen ingression were characterized and discussed. The UFG martensite colonies produced by the AUS + ART process were found to be detrimental to ductility regardless of the amount of hydrogen, which is likely attributed to the reduced lattice bonding strength according to the H-enhanced decohesion (HEDE) mechanism. With an increase in the hydrogen amount, the mixed microstructure (granular + lamellar) in the ART specimen revealed a clear embrittlement transition with the possible contribution of HEDE and H-enhanced localized plasticity (HELP) mechanisms. View Full-Text
Keywords: medium-Mn steel; austenite-reversed-transformation; retained austenite; hydrogen embrittlement; ultrafine-grained microstructure; strain-hardening behavior medium-Mn steel; austenite-reversed-transformation; retained austenite; hydrogen embrittlement; ultrafine-grained microstructure; strain-hardening behavior
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Shen, X.; Song, W.; Sevsek, S.; Ma, Y.; Hüter, C.; Spatschek, R.; Bleck, W. Influence of Microstructural Morphology on Hydrogen Embrittlement in a Medium-Mn Steel Fe-12Mn-3Al-0.05C. Metals 2019, 9, 929.

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